hair reducer test

import bpy

bl_info = {
    "name": "Hair Reducer",
    "author": "William Chargin (WChargin)",
    "version": (0, 0, 1),
    "blender": (2, 67, 0),
    "location": "File > Save",
    "description": ("Reduces hair particles on save and restores on load."),
    "warning": "",  # used for warning icon and text in addons panel
    "category": "System"}

@persistent
def hair_reduce(dummy):
    for ps in bpy.data.particles:
        if ps.type == 'HAIR' and not 'actual_hair_count' in ps:
            ps['actual_hair_count'] = ps.count
            ps.count = 1

@persistent
def hair_apply(dummy):
    for ps in bpy.data.particles:
        if ps.type == 'HAIR' and 'actual_hair_count' in ps:
            ps.count = int(ps['actual_hair_count'])
            del ps['actual_hair_count']

def register():
    bpy.utils.register_module(__name__)
    if not hair_apply in bpy.app.handlers.load_post:
        bpy.app.handlers.load_post.append(hair_apply)
    if not hair_reduce in bpy.app.handlers.save_pre:
        bpy.app.handlers.save_pre.append(hair_reduce)
    if not hair_apply in bpy.app.handlers.save_post:
        bpy.app.handlers.save_post.append(hair_apply)

def unregister():
    bpy.utils.unregister_module(__name__)
    if hair_apply in bpy.app.handlers.load_post:
        bpy.app.handlers.load_post.remove(hair_apply)
    if hair_reduce in bpy.app.handlers.save_pre:
        bpy.app.handlers.save_pre.remove(hair_reduce)
    if hair_apply in bpy.app.handlers.save_post:
        bpy.app.handlers.save_post.remove(hair_apply)

if __name__ == "__main__":
    register()